Patents by Inventor Hartmut Randolph

Hartmut Randolph has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Photographic silver halide element with gelatin layer containing silica
    Patent number: 5292628
    Abstract: The adhesion of photographic layers to a film base thateither has, on one or both sides, a surface consisting of a polyolefin layer that has been treated with a corona discharge,or consists of a polyester film provided with a (first) substrate layeris improved by an adhesive layer that is applied in the form of an oil-in-water emulsion consisting of50 to 60 wt % of oil-formers and40 to 50 wt % of a solid consisting of50 to 80 wt % gelatin and20 to 50 wt % colloidal SiO.sub.2together with the following layers to the surface of the film base.
    Type: Grant
    Filed: April 27, 1993
    Date of Patent: March 8, 1994
    Assignee: AGFA Gevaert AG
    Inventors: Fritz Nittel, Heinz-Gunther Auweiler, Manfred Peters, Hartmut Randolph